Rule History

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET POLICY SSL/TLS Certificate Observed (Free File Hosting Service (api .anonfiles .com))"; flow:established,to_client; tls.cert_subject; content:"CN=api.anonfiles.com"; bsize:20; fast_pattern; tls.cert_issuer; content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"; bsize:52; reference:md5,74d2206a0f29c6d975cba20028284ca2; classtype:policy-violation; sid:2031019; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_10_14, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2020_10_14;)